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However, you can tell your firewall to open up certain ports for use, which is pretty much the same thing.
QuoteHowever, you can tell your firewall to open up certain ports for use, which is pretty much the same thing....but it's very dangerous thing to do. A firewall protects a computer fully, only when your computer is invisible to the outside world (ports are invisible), and all ports are closed. It's different when you have router + software firewall combo. When you open a port using router, your software firewall still protects you.